That Grammy-nominated musician Kenna, along with Mark Foster of Foster the People, is climbing Mount Kilimanjaro as part of the Summit on the Summit initiative, which raises awareness for the global clean-water crisis . . . That “Dirty Little Liars” star Ashley Benson has signed on as the new face of evening-wear designer Faviana, and the deal will be announced Monday . . . That award-winning “Girls” costume designer Jenn Rogien has joined lingerie and intimates brand Aerie as its style and fit expert.